Darenimo Naisho de.

A well-liked and attractive male student, Maki, remains a virgin, believing intimacy should only occur within feelings of affection. His classmate Miyashita discovers this secret and blackmails him into a relationship for silence. Maki agrees hesitantly, only to learn that Miyashita has a strong sadistic nature. The story spans several volumes, including a side story titled *Fukigen My Lover*.